Air-brake apparatus.



G.- E. DUFFIE. AIB BRAKE APPARATUS. APPLIouIoN FILED JULY 25. 1907.

Patented Dee. 22, 1908. Nmccn's vr'e:

UNITED s'rAr'Es PATENT oimion.v

.e'HARLEs E.. Burnin, oF .oMAHA,;N'EBnasIia.

.im-.snm urinaires.

Specication of Letters Patent.

Patented nee. 2 2, 1908.

Original application ledApril 27, 1907, Serial No. 370,590. Divided andthis application tiled July 25, 1907.

Serial No. 385,500.

To all it may concern:

Be 1t known vthat I, CHARLES E. DUFFIE, a

-citizen of the United States, residing at Omaha, in the county ofDouglas and State of Nebraska, have invented certain new and usefulImprovements in Air-Brake Apparatus, of which the following is aspecifica- `section of the road.

One of the'objects of my invention is to provide a valve which shalloperate automatically to reduce the train-pipe pressure.

Another object of my invention is the provision in such a valve of anautomatic cut-off between the main reservoir and the train pipe in orderto prevent loss of pressure air. n the accompanying drawings Figurel isa vertical central section of a' valve embodying my invention showingthe valve in the normal posi-tion. v l? ig. 2 also represents a verticalcentral sectionalview of the valve in the operative position. Fig. 3 isa some- What diagrammatic view showing the valve in operative relationto an air brake apparatus. l

'lhe valve herein shown'comprises a casing 1 preferably 'of the globevalve type, adapted -to be included in the train pipe below theengineers brake valve. Said casing is divided by a partition 2 formingthe chambers 3 and 4, the former being connected With Ithe engineerslbrake valve and the latter with the portion of the train pipe runningto the brakes, as shown in Fig. 3. In the partition 2 is a port 5 whichis thcfonlymeans of communication between the train pipe and theengineers brake\valve. An .opening 6 in one wall of the casing 1 leadsfrom the chamber 4 to the atmosphere and acts as a bearing for one endof the valve stem 7. A recess 8 in the op osite'wall of thecasing'prpvidesa bearing or the yopposite :end of said valveA stem.'lire .space in the recess 8 'tothe rear ofthe valve stem 7 ispreferably open tothe pressure Within the valve casing` Said recess isherein shown asslightly larger in vdiameter than the stem 7 so as topermit of the liow of pressure air into said recess.

'I he valve stem 7 carries thevalve disk 9 adapted to close the port 5and has one or more channels 10 formed therein adapted ,to connect thechamber 4 with the atmosphere.v On one end of said valve stem is avalve'disk 11 adapted to seat upon a valve seat 12 formed about theouter end of the opening. Two forks 13 and 14 containing the bolts.15and 16 are iixed to the casing 1, said bolts acting respectively asfulcrum and stop for a lever 17. ln the present embodiment thevalveidisk'9 is arranged. normally to vbeheld unseated and the valve'disk '11 seated by meansv adapted to be Vacted.'upon oy-'a suiti 'able`block signal apparatus "(not shown).

Said means comprises an electro-magnet '18, the coil oi which isinciuded in a cab circuit arranged to be interrupted when a dangercondition exists. 'lhe armature 19 of the electro-magnet 18 is connectedwith the lever 17 in any suitable way.

Assuming the road armature 19 will remain in contact with said magnetandthe lever will hold the valve'dis'k 11 seated and valve .disk 9unseated. IThe train vipe is thus lopen, allowing ordinary operatlon ofthe brakes. Should the current be cut 0E from the `electro-magnet 18,'as in case ofaubl'ocked section,'the lever will be free to 'moveThe'pressurefof the Vair withinthe valve casing on the combined areas.of the end of the valve stem 7,"within the recess 8, and thecorresponding side of the valve disk 9 overcomes the pressure upon theopposite side of the valve disk 9 `and the atmospheric pressure fromWithout upon the valve stem, and seats said valve disk 9 and unseats thevalve disk 11. The

to be clear and the `electro-magnet 18 therefore energized, the

channels 10 now aord direct communication between the train pipe and theatmosphere, and the drop in the train pipe prssure causes a serviceyapplication of the brakes. The simultaneous seating of the disk 9Aprevents loss of main reservoir pres- The brakes will beappliedwith-'more or tess 'torce laccording :to "the .size of the openingsleading to the atmosphere. l

As 'the 'encino passes out :of operative connection with the signalcircuit, as de- 5 ing the amature '19, and reopening normal vtrain pipeconnections. Being inserted 1n the train line below the engineers. brakevalve, the valve herein described, When-automatically operated as justset Aforth, de,

brakes through `the engineers brake valve. -As the articularconstructlon herem shown is on y one ofnumerous precise construction setforth.

I claim as my invention:v

1. In 'air brake apparatus, in combination, a train line; 'an engineersbrake valve; means for opening the train lineto the atmosphere; andmeans operating simultaneously therewith and moving in the direction ofthe air current flowing through the engineers brake valve for cutting oithe engineers brake valve from the train line.

2. In air brake apparatus, in combination,

a train'line; a main reservoir; means for i opening the train line tothe atmosphere; means for cutting 0H the main reservoir from 4the, trainline ;'1 and electrical means for hold- 30 ing both of said means in theinoperative position.

3. 1n air brake apparatus, in combination, a train line; a mainreservoir; means for bpening the train line` to the atmosphere;

35 means for .cutting 0E the main reservoir from the train line; a leveroperatlvel)T con-v nected with both of said means; and electrical meansfor acting upon said lever to hold both of Asaid means in. theinoperative position.

4. In tion, a valve casing comprising two commu'- nicating chambersadapted to be connected in the train line, one of said chambers havingan opening communicating with the atmosphere; a valve member in theother chamer for closing communication between said chambers; and avalve member for closing said opening to the atmosphere, said valvemembers being arranged to move together.

5. In air brake apparatus, in combination, a valve casing comprising twocommunicating chambers adapted to be connected in the train line; meansfor opening one of said chambers to the atmosphere; and se arate meansfor closing communication e'- tween said chambers.

6. In air brake apparatus, in combination, a valve casing comprising twocommunicating chambers adapted to be connected in the train line, one ofsaid chambers having-v an openm communicatin with thel atmosphere; an avalve stem aving thereon a valve member in the other chamber adaptedprives the engineer of all control of they possible designs, I'do notwish to be limited to thel air brake apparatus, in combinato closecommunication between said chame senese bers and' env@ member adaptedt10- dos@ the said opening, one of said valve members being arranged tobe seated when the other is unseated.

. 7. In air brake apparatus, in combinar tion, a valve casing comprisingtwo commu? nicatlng chambers adapted to be connected 1n the train line,one of said chambers having' an opening 'communicating with theyatmosphere; avalve stem havin thereon avalve member mths other cham erAadapted to close communication between said chambers and a valve memberadapted to close the said opening, one of said valve members beingarranged to be seated when theother is unseated; and means' forholding-said valve stem in position to close said opening.

- 8. In air brake apparatus, in combination, -a valvecasingeomprisingtwo` commu@ nicating chambers, one olhsail chambersbeing adaptedto be connected witha portion of the train line extendingtothe engineers brake valve, and the other chamber being adapted tocommunicate With the portion of i the train line running to the brakes;a valve .stem slidably mounted in said valve casing;

a valve member on said stem for closin commumcation between sa1dchambers, sa;

valve stem extending through an opening arranged to connect the secondmentioned chamber with the atmosphere; avalve inember on said. valvestem ada ted to close'gsaid opening, sai-d valve stem eing vformed topermit the passage of air to said opening when said last mentioned valvemember is unsea-ted; and meansvfor moving said valve stem in onedirection.

9. In an air brake apparatus, in combination, a valve casing adapted tocommunicate with the portion of the train line extending '105'.

to the engineers brake valve and the portion of the train line runningtothe brakes; a

valve device adapted, to open communicationy between the atmosphere andthe ortion of the train line running to the bra es;

, a lever for operating said valve device; and

an electro-magnet normally holding said lever in osition to'close'communication between t e atmosphere and the portion oftrain'line running to the brakes. f i

10. In anv air brakeI apparatus, incombination,ia valve casingcomprising two communicating chambers, one of said chambers beingadapted to be connected with the' portion of the train line extending tothe engineers brake valve, and the other chamber being adapted tocommunicate with the ortion to the train line running to vthebra es,said last mentioned chamber having an opening communicating with theatmosphere; a.

valve stein slidably mounted in ..sa1d\valve casing; a valve 'member onsaid stem for closing communication between said chambers; a valvemember on said stem for closing the said opening, one of said lmembersISO being arranged tobe seated when the other tween the atmosphere andthe portion of is unseated, said stem being adapted to perthe train linerunning to the brakes. mit the passage of pressure-air past it when thevalve member for said opening,r is un- CHARLES E' DUFFIE' 5 seated;alever for operating said valve stem; Witnesses: Y

and an electro-magnet normally holding said WILL H. THOMPSON,

lever in position to close communication be- JOHN F. STOUT.

